Reginald Martinez Jackson (born May 18, 1946), nicknamed "Mr. October" for his clutch hitting in the postseason, is an American former Major League Baseball right fielder who played for five different teams from 1967 to 1987. He won three consecutive World Series titles as a member of the Oakland A's in the early 1970s and also won 2 consecutive titles with the New York Yankees. He was inducted into the Hall of Fame in 1993